* Astronomy

Polish Explorer Says He's Found Deepest Underwater Cave

A team of explorers say they have discovered the world's deepest underwater cave, 404 meters down, near the eastern Czech town of Hranice.
Polish explorer Krzysztof Starnawski found the cave Tuesday in the flooded limestone Hranicka Propast, or Hranice Abyss, which he has explored since 1998. He scuba dived to a narrow slot at 200 meters' depth and let through a remotely operated underwater robot, or ROV, that went to the depth of 404 meters.
Read more